#040B2C#040B2C

#040B2C is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 16.9% C 0.068 H 267.2°. Best body text is #FFFFFF at 19.28:1 contrast (WCAG AA passes).

Color values

HEX	#040B2C
RGB	rgb(4, 11, 44)
HSL	hsl(230, 83%, 9%)
HSV	hsv(230, 91%, 17%)
CMYK	cmyk(90.9%, 75%, 0%, 82.7%)
CIE-LAB	lab(4.04, 8.17, -21.81)
CIE-LCH	lch(4.04, 23.29, 290.54°)
OKLab	oklab(16.9% -0.0033 -0.0677)
OKLCH	oklch(16.9% 0.068 267.2)
XYZ	xyz(0.6242, 0.4469, 2.4358)
Luminance	0.0045 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 5.02

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040B2C #2C2504

analogous

#041F2C #040B2C #11042C

triadic

#040B2C #2C040B #0B2C04

tetradic

#040B2C #2C041F #2C2504 #042C11

square

#040B2C #2C041F #2C2504 #042C11

split-complementary

#040B2C #2C1104 #1F2C04

monochromatic

#03071C #03071C #040B2C #091964 #0E279C

Accessibility & contrast

On white

19.28

#040B2C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#040B2C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040B2C

19.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040B2C	#FFFFFF	#000000	##FFFFFF
##040B2C	1.00	19.28	1.09	19.28
#FFFFFF	19.28	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00102D

Deuteranopia (green-blind)

#000C2B

Tritanopia (blue-blind)

#001319

Achromatopsia (no color)

#0E0E0E

Design tokens & code

CSS

--color: #040b2c;
/* rgb */ color: rgb(4, 11, 44);
/* oklch */ color: oklch(16.9% 0.068 267.2);

Tailwind

colors: {
  custom: {
    50: '#4a4b65',
    500: '#040b2c',
    950: '#000000',
  },
}

SCSS

$custom: #040b2c;
$custom-light: #4a4b65;
$custom-dark: #000000;

JSON

{
  "hex": "#040b2c",
  "rgb": {
    "r": 4,
    "g": 11,
    "b": 44
  },
  "hsl": {
    "h": 229.5,
    "s": 83.333,
    "l": 9.412
  },
  "oklch": {
    "l": 0.16903,
    "c": 0.06775,
    "h": 267.2
  },
  "luminance": 0.00447
}

Semantic roles & 50–950 ramp

primary

#040B2C

secondary

#6F601D

accent

#D62EFA

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010105

muted

#77777A

Preview Lab

Preview with #040B2C

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →